sexual union

美 [ˈsekʃuəl ˈjuːniən]英 [ˈsekʃuəl ˈjuːniən]

sexual union

noun

the act of pairing a male and female for reproductive purposes: the casual couplings of adolescents; the mating of some species occurs only in the spring; Synonym: coupling mating pairing conjugation union

数据来源：WordNet

1

This gesture hails back to ancient times , when the Romans used it to indicate sexual union .

这个手势的来历要追溯到古罗马时期，当时人们用其来指代性关系。
2

The specific areas of brain activity suggest that the males are evaluating potential mates before agreeing to a sexual union .

特定区域的大脑活动暗示雄性绒猴在性结合之前会评估潜在的交配对象。
3

When the sacredness of sexual union is felt , it is possible to experience your connection to the life force itself , the source of creation .

当性的神圣融合起来就是粘结，可能会体验到你与生命力量本身，创造的源头的联系。